Communications: radio wave antennas – Antennas – With vehicle
Patent
1975-08-18
1977-06-07
Lieberman, Eli
Communications: radio wave antennas
Antennas
With vehicle
343860, 343900, H01Q 132
Patent
active
040287041
ABSTRACT:
The feed point of a whip antenna having a length less than one quarter-wavelength at the lowest frequency of operation is raised above a counterpoise ground plane by a short base sleeve. Gain over a 2.5:1 bandwidth of radio frequencies closely approaches the gain of a standard quarter-wavelength antenna without requiring use of power-dissipating resistance loading. A ferrite transformer at the whip antenna feedpoint is utilized to reduce the high anti-resonance impedance of the broadband whip antenna to the characteristic impedance of a coaxial cable transmission system and to minimize the VSWR thereof. The base sleeve raises the antenna resistance at the resonant frequency near the lower end of the bandwidth to make the transformer effective as an impedance matching element over the entire radio frequency band.
A pair of the whip antennas are axially aligned and electrically coupled in series to realize a broadband dipole having increased gain. A pair of dipoles are energized in phased relationship to realize even higher gain and directivity.
REFERENCES:
patent: 2636122 (1953-04-01), Hayes
patent: 2709219 (1955-05-01), Schmidt
patent: 3267476 (1966-08-01), Finke
patent: 3453618 (1969-07-01), Ukmar et al.
patent: 3530410 (1970-09-01), Parker
Beam Systems Israel Ltd.
Lieberman Eli
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